Microstructure evolution of AA1070 aluminum alloy processed by micro/meso‑scale equal channel angular pressing
Abdel-Aziem, Walaa; Hamada, Atef; Makino, Takehiko; Hassan, Mohsen A. (2019-11-25)
Abdel-Aziem, W., Hamada, A., Makino, T. et al. Microstructure Evolution of AA1070 Aluminum Alloy Processed by Micro/Meso-Scale Equal Channel Angular Pressing. Met. Mater. Int. 27, 1756–1768 (2021). https://doi.org/10.1007/s12540-019-00544-4
© The Korean Institute of Metals and Materials 2019. This is a post-peer-review, pre-copyedit version of an article published in Metals and Materials International. The final authenticated version is available online at: https://doi.org/10.1007/s12540-019-00544-4
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe202001283706
Tiivistelmä
Abstract
The Micro/meso-forming of commercially pure aluminum, AA1070, processed at room temperature by equal channel angular pressing (ECAP) with a die channel angle of 90° through 4 deformation passes has been conducted. Microstructure features, such as grain size, misorientation angle distributions and the developed texture during the four deformation passes of micro/meso-ECAP have been investigated by Electron backscattering diffraction (EBSD) technique. Then, hardness measurements over the cross-section of the processed samples were correlated with the EBSD analysis. EBSD scans revealed that extended shear bands are formed and represent the microstructural feature induced during micro/meso-forming. Whereas, a non-uniform grain structure consisting of intensive low-angle grain boundaries was obtained in the first pass, a uniform ultrafine-grained structure of high-angle grain boundaries (in the range of 1–2 μm) was achieved at the fourth pass. Consequently, a significant improvement in the hardness value to 65.3%, with respect to the starting material, was achieved due to the enhancement of the fine grain structure. The texture analysis exhibited that the high plastic shear strain associated with micro/meso-scale ECAP was capable to develop a weak texture in the flow plane compared to the starting texture.
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